I’ve been diving into the complexities of lens coating applications, and I’m curious about what everyone thinks is the toughest to get right. I often hear that anti-reflective coatings can be tricky due to their exacting precision requirements. Is there a specific experience you’ve had where a coating didn’t adhere as expected, or is there a coating you find particularly challenging to work with?
Totally agree about anti-reflective coatings! I once struggled with adhesion during high humidity, and it caused a ton of waste. It’s all about that environment — really makes a difference! 
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I’ve definitely had my share of trouble with anti-reflective coatings too. Once, I did a batch with a rushed setup and ended up with inconsistent adhesion — lesson learned about the importance of prep time. @JohnDoe mentioned humidity affecting his results, and I can relate; environmental factors really can’t be overlooked, especially when you’re dealing with precision coatings.